My son still loves the breasts

So my son was exclusively breastfed up until we found out we were pregnant with our 3rd baby (he was about 16 months) I was advised to stop giving my son breastmilk because I was high risk and it could lead to miscarriage. Anyway, I'm 8 months pregnant now and my son is only drinking home milk now. But he loves to play with my boobs. In order for him to sleep he has to reach down my shirt to sleep. When I get out of the shower and dress he sees my breasts and automatically gets so happy and pointing at my breasts. It's like hes never forgotten about them and still wants it. Lol. He wont try to drink from them anymore but he gets really excited for them. Idk how to feel about this.🤦‍♀️ I dont want him growing up in school thinking it's okay to touch other girls boobs or being fascinated by them lol. I know he doesn't mean wrong, hes almost 2. But I want to break that habit. Is this normal? Can I get some suggestions?